python repr

1
2class Person:
3    name = ""
4    age = 0
5
6    def __init__(self, personName, personAge):
7        self.name = personName
8        self.age = personAge
9
10    def __repr__(self):
11        return {'name':self.name, 'age':self.age}
12
13    def __str__(self):
14        return 'Person(name='+self.name+', age='+str(self.age)+ ')'
15

1>>>x=4
2>>>repr(x)
3'4'
4>>>str(x)
5'4'
6>>>y='stringy'
7>>>repr(y)
8"'stringy'"
9>>>str(y)
10'stringy'

1# The repr() function returns a printable representational string of the given object.
2>>> var = 'foo'
3>>> print(repr(var))
4"'foo'"

1import datetime
2now = datetime.datetime.now()
3now.__str__()
4#>>> '2020-12-27 22:28:00.324317'
5now.__repr__()
6#>>> 'datetime.datetime(2020, 12, 27, 22, 28, 0, 324317)'

1#!/bin/python3
2
3import math
4import os
5import random
6import re
7import sys
8
9class Car:
10    def _init_(self,speed,unit):
11        self.speed=speed
12        self.unit=unit
13    def __str__(self):
14        return "Car with the maximum speed of {} {}".format(self.speed,self.unit)  
15
16class Boat:
17    def _init_(self,speed):
18        self.speed=speed
19    	def __str__(self):
20        	return "Boat with the maximum speed of {} knots".format(self.speed)  
21            
22            
23check the indentation of Boat class __str__() method, it should be as shown below.
24  
25class Boat:
26    def _init_(self,speed):
27        self.speed=speed
28    def __str__(self):
29        return "Boat with the maximum speed of {} knots".format(self.speed)  

1>>>repr(y)
2"'a string'"
3>>>y2=eval(repr(y))
4>>>y==y2
5True